The last thing that you want to do is to amerce your cassette in water. Make 
sure that anything that comes in contact with the audio tape is clean such as 
the tape transport, capstan, pinch roller, and record and playback heads. Once 
that is done, and the tape still squeeks then you may want to try the 
following.   
Tape Baking
When magnetic recording tapes are being stored, moisture is slowly absorbed by 
the binder that holds the components of the tape together. Affected tapes will 
squeak when played back. The squeaking can be heard directly from the tape 
passing over the playback head and other fixed parts of the player, but is also 
transmitted electronically through the playback head. Often the tape will also 
sound dull and distorted.

If you hear a tape that is squeaking, stop playing the tape immediately. 
Continuing to play a squeaking tape can cause permanent damage to the tape, and 
in some cases damage to the player.

This problem can happen to any tape, but is more common in tapes manufactured 
after the mid 1970s in the USA.

The solution to the problem of squeaking tapes is to bake the tapes at very low 
temperature in an oven. There are as many different opinions about optimum 
temperature and duration of baking as there are audio engineers. Certainly, do 
not attempt to bake your own tapes unless you can be certain that the 
temperature in your oven will not exceed 60 degrees Celsius 

CD ROM Services Pty Ltd offers a tape baking service, and although we have 
successfully baked well over a hundred tapes, and haven't damaged one, we will 
take all care in baking your tapes, but cannot take responsibility for 
accidental damage. If you give us your tapes to bake, it is on the basis that 
you agree with this

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